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DIET, TEMPERATURE, AND THE LOGISTIC MODEL OF DEVELOPMENTAL RATE FOR TRIBOLIUM CONFUSUM (COLEOPTERA: TENEBRIONIDAE)1

Published online by Cambridge University Press:  31 May 2012

R. J. Lamb  and
S. R. Loschiavo
R. J. Lamb
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
S. R. Loschiavo
Affiliation:
Research Station, Agriculture Canada, Winnipeg, Manitoba R3T 2M9
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Abstract

The developmental rates of individual larvae of Tribolium confusum Jacquelin duVal were measured at five temperatures on three diets to quantify the interaction between these two environmental factors. No significant differences in survival were detected but developmental times were affected by both factors. A logistic equation accurately described the relationship between mean developmental rate and temperature for each diet. The variance in developmental rate was a linear function of the mean developmental rate, and the mean accounted for more of the differences in variance than diet or temperature.

The effect of diet was greatest at the temperature which caused the highest developmental rate. It decreased as temperature decreased. This effect could be accounted for by varying the coefficient K, the asymptote of the logistic equation. The coefficient K showed a positive linear relationship to the lysine content of the diet. This coefficient may provide a compact and quantitative means of summarizing the interaction of environmental factors such as diet and temperature in the logistic model for the developmental rate of insects.

Résumé

Les taux de développement de larves de Tribolium confusum Jacquelin duVal ont été mesurés à cinq températures et trois rations différentes pour quantifier l’interaction de ces deux facteurs ambiantaux. On n’a décelé aucune différence significative dans la survie, mais les deux facteurs ont influé sur les temps de développement. L’équation logistique décrit avec précision les rapports entre le taux de développement moyen et la température pour chaque ration. La variance du taux de développement est fonction linéaire du taux de développement moyen, et cette moyenne explique davantage les différences de variance que la ration ou la température.

L’effet de la ration est plus marqué à la température qui permet le taux de développement le plus rapide, mais diminue avec la baisse de température. Cet effet pourrait s’expliquer par la variation du coefficient K, l’asymptote de l’équation logistique. Le coefficient montre une corrélation linéaire positive avec la teneur en lysine de la ration. Il pourrait fournir un moyen commode et quantitatif pour résumer l’interaction de facteurs ambiantaux comme la ration et la température dans le cadre du modèle logistique appliqué au taux de développement des insectes.

Type
Articles
Information
The Canadian Entomologist , Volume 113 , Issue 9 , September 1981 , pp. 813 - 818
Copyright
Copyright © Entomological Society of Canada 1981

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